/* 清除浏览器默认样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  font-family: Arial, sans-serif;
  line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
}

ul, ol {
  list-style: none;
}

a {
  text-decoration: none;
}

button {
  border: none;
  background: none;
}
